For Automotive Battery Protection IC For 3-Serial To 5-Serial Cell Pack (Secondary Protection) S-8235A Series

Available Applications
Automotive ICs are categorized according to their application. The following symbols indicate the types of applications for which an IC can be used.
Safety critical components typified by engine, transmission, suspension and ABS, and EV/HEV/PHEV related equipment, etc.
Meter, body, headlamp, ITS, etc.
Accessory, car navigation, car audio system, etc.

The S-8235A Series, for automotive use, is utilized for secondary protection of lithium-ion rechargeable batteries, and incorporates high-accuracy voltage detection circuits and delay circuits. Short-circuiting between cells makes it possible for serial connection of 3-cell to 5-cell. By connecting in cascade, the S-8235A Series protects 6-serial or more cells lithium-ion rechargeable battery pack.
The S-8235A Series performs a self-test operation to confirm overcharge detection.

Caution : This product can be used in vehicle equipment and in-vehicle equipment. Before using the product in the purpose, contact to SII is indispensable.


High-accuracy voltage detection circuit for each cell
Overcharge detection voltage n (n = 1 to 5)
 3.60 V to 4.50 V (50 mV step)
 Accuracy ±20 mV (Ta = +25°C)
 Accuracy ±30 mV (Ta = −5°C to +55°C)
Overcharge hysteresis voltage n (n = 1 to 5)
 0.0 mV to −550 mV (50 mV step)
 −300 mV to −550 mV Accuracy ±20%
 −100 mV to −250 mV Accuracy ±50 mV
 0.0 mV to −50 mV Accuracy ±25 mV
Self-test operation to confirm overcharge detection is available.
Cascade connection is available.
Delay times for overcharge detection can be set by an internal circuit only (External capacitors are unnecessary).
High-withstand voltage
Absolute maximum rating 26 V
Wide operation voltage range
6 V to 24 V
Wide operation temperature range
Ta = −40°C to +85°C
Low current consumption
At VCUn − 1.0 V for each cell : 10 μA max. (Ta = +25°C)
At 2.3 V for each cell : 8 μA max. (Ta = +25°C)
Lead-free (Sn 100%), halogen-free
AEC-Q100 qualified


  • Lithium-ion rechargeable battery pack (for secondary protection)